Discussion on mechanism and development status of

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Discussion and development status of anti-static coating mechanism

discussion and development status of anti-static coating mechanism

August 12, 2020

1. Anti static historical development node

anti static coating has developed with modern science and technology, and has a development history of more than half a century. As early as 1948, the United States published a patent for making conductive adhesive from silver and epoxy resin, which was the first published conductive coating. In the 1950s, Japan began to produce anti-static coatings based on silver and carbon. In the 1960s, the United States, Britain, Japan and other countries successively developed antistatic coatings. In the 1980s, foreign anti-static technology and electrothermal coating technology developed rapidly, and China began to research and apply anti-static coatings in the 1950s

2. Antistatic fillers at different development stages

antistatic coatings are divided into additive and intrinsic types. The commonly used conductive fillers include carbon based materials (carbon black, graphite, etc.), metal powders (silver powder, copper powder, nickel powder, etc.), semiconductor metal oxides (tin oxide, iron oxide, zinc oxide), conductive nanoparticles and antistatic additives, conductive fibers, etc.

3 Research status of domestic anti-static coatings

the research of anti-static coatings in China rose in the 1950s. Tianjin paint hydraulic cylinder horizontal placement plant, Shanghai synthetic resin Research Institute and Wuhan Chemical Research Institute developed anti-static coatings with low resistivity. In the early 1990s, CNOOC Changzhou coating Chemical Research Institute developed an anti-static rain erosion resistant coating system. The anti-static coating uses conductive carbon black as the conductive filler. Because the conductive filler uses carbon black, its color is black; At the beginning of this century, the Institute developed a new generation of light color antistatic coatings by using new composite conductive materials as conductive media

4. Research status of antistatic coatings abroad

antistatic coatings were extensively studied and produced in foreign countries as early as the 50th generation of the 20th century. Japan developed and produced various types of conductive coatings in 1957. The United States has developed a series of anti-static coatings for airborne radomes since the 1950s. In the late 20th century, the United States added conductive fibers and other anti-static coatings to polyurethane and other coatings to obtain coatings with excellent anti-static performance and widely used

5. The length diameter ratio of conductive materials

when carbon nanotubes are used as conductive fillers, the smaller their pipe diameter, the better the conductivity of the coatings. The best length diameter ratio of carbon nanotube as conductive filler is about 250. The action of the main hydraulic cylinder of the experimental machine is mainly controlled by the industrial computer plus qualified d/a, digital i/o, measuring card and PLC. When the length diameter ratio of carbon nanotube is greater than 250, the conductivity of the coating decreases with the decrease of length and the increase of the insulation resistance diameter ratio of experimental machine components. When the length diameter ratio of carbon nanotube is less than 250, the conductivity of the coating increases with the increase of length diameter ratio. The higher the content of carbon nanotubes, the better the conductivity of the coating. When the content of carbon nanotubes is greater than or equal to 0.5% (percolation threshold), the carbon nanotubes are well dispersed in epoxy resin, and the coating has good conductivity. The surface resistivity of antistatic coating is usually 10^5~10^5 Ω· m

6. In recent years, with the development of modern industry, the performance requirements and demand of antistatic coating will be further improved. In recent years, with the continuous emergence and industrialization of new conductive fillers such as conductive fibers and carbon nanotubes, it will be an inevitable trend to replace traditional conductive fillers such as carbon and precious metal powders, and will play a more important role in the fields of electronic industry, construction industry, aviation and military industry

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